Apple's iOS 8 update last year included improvements to the Photos app, messaging, the keyboard and more (not to mention a few serious bugs). But, it didn't alter the look of your phone all that much. You won't be able to the say the same about iOS 9. Rumor has it that Apple is working on a new mobile operating system that will give your gadgets quite the facelift.

Apple hasn't commented on any upcoming changes, but sources told the 9to5mac blog that iOS 9 is going to include a new default wallpaper that uses a green and blue design scheme. Siri is also going to get a cosmetic update to make it more colorful like the Apple Watch version of the feature, according to the sources.

Just for comparison, here's what Siri now looks like on the Watch along with the same app on iPhone in the current iOS 8.2 system.

The rumors also hint at some changes that you won't be able to see. iOS 9 should take care of some of the bugs and usability issues that popped up with iOS 8.